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[Rodolfo Alonso <1940073@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1940073

Title:
  "Unable to create the network. No available network found in maximum
  allowed attempts." during rally stress test

Status in neutron:
  Fix Released

Bug description:
  When running rally scenario NeutronNetworks.create_and_delete_networks
  with concurrency of 60 the following error is observed:

  --8<--8<--8<--
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api [req-61e1d9da-1bad-4410-94ce-d2945c13a2d5 05971ba84eac4b8eb176bd935909f9d0 03904310315c47c7b33178da2bfc99a2 - default default] DB exceeded retry limit.: oslo_db.exception.RetryRequest: Unable to create the network. No available network found in maximum allowed attempts.
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api Traceback (most recent call last):
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_db/api.py", line 142, in wrapper
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     return f(*args, **kwargs)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron_lib/db/api.py", line 183, in wrapped
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     LOG.debug("Retry wrapper got retriable exception: %s", e)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     self.force_reraise()
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     six.reraise(self.type_, self.value, self.tb)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/six.py", line 703, in reraise
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     raise value
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron_lib/db/api.py", line 179, in wrapped
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     return f(*dup_args, **dup_kwargs)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/plugin.py", line 1053, in create_network
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     result, mech_context = self._create_network_db(context, network)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/plugin.py", line 1012, in _create_network_db
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     tenant_id)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/managers.py", line 226, in create_network_segments
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     context, filters=filters)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/managers.py", line 312, in _allocate_tenant_net_segment
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     segment = self._allocate_segment(context, network_type, filters)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/managers.py", line 308, in _allocate_segment
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     return driver.obj.allocate_tenant_segment(context, filters)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/drivers/type_tunnel.py", line 391, in allocate_tenant_segment
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     alloc = self.allocate_partially_specified_segment(context, **filters)
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/drivers/helpers.py", line 153, in allocate_partially_specified_segment
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api     exceptions.NoNetworkFoundInMaximumAllowedAttempts())
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api oslo_db.exception.RetryRequest: Unable to create the network. No available network found in maximum allowed attempts.
  2021-08-16 11:28:41.526 710 ERROR oslo_db.api
  --8<--8<--8<--

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